A vicar's son was asked to entertain the visiting bishop while his parents prepared the lunch. The boy asked him, "Can you tell me how you become a bishop?" The bishop replied, "Well, first you have to go to church every Sunday, then be top pupil in Sunday school and later be best student at theological college. Then you get ordained and when you are the best vicar in the diocese you become a bishop". "Oh I see" said the boy, "because I heard my dad say to my mum this morning he wondered how on earth you became a bishop"